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108 lines
4.8 KiB
HTML
108 lines
4.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Ada Settings (Debugging with GDB)</title>
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<meta name="description" content="Ada Settings (Debugging with GDB)">
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<meta name="keywords" content="Ada Settings (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Ada.html#Ada" rel="up" title="Ada">
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<link href="Ada-Glitches.html#Ada-Glitches" rel="next" title="Ada Glitches">
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<link href="Ravenscar-Profile.html#Ravenscar-Profile" rel="prev" title="Ravenscar Profile">
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</style>
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</head>
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<body lang="en">
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<a name="Ada-Settings"></a>
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<div class="header">
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<p>
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Next: <a href="Ada-Glitches.html#Ada-Glitches" accesskey="n" rel="next">Ada Glitches</a>, Previous: <a href="Ravenscar-Profile.html#Ravenscar-Profile" accesskey="p" rel="prev">Ravenscar Profile</a>, Up: <a href="Ada.html#Ada" accesskey="u" rel="up">Ada</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Ada-Settings-1"></a>
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<h4 class="subsubsection">15.4.10.10 Ada Settings</h4>
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<a name="index-Ada-settings"></a>
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<dl compact="compact">
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<dd><a name="index-set-varsize_002dlimit"></a>
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</dd>
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<dt><code>set varsize-limit <var>size</var></code></dt>
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<dd><p>Prevent <small>GDB</small> from attempting to evaluate objects whose size
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is above the given limit (<var>size</var>) when those sizes are computed
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from run-time quantities. This is typically the case when the object
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has a variable size, such as an array whose bounds are not known at
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compile time for example. Setting <var>size</var> to <code>unlimited</code>
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removes the size limitation. By default, the limit is about 65KB.
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</p>
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<p>The purpose of having such a limit is to prevent <small>GDB</small> from
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trying to grab enormous chunks of virtual memory when asked to evaluate
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a quantity whose bounds have been corrupted or have not yet been fully
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initialized. The limit applies to the results of some subexpressions
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as well as to complete expressions. For example, an expression denoting
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a simple integer component, such as <code>x.y.z</code>, may fail if the size of
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<code>x.y</code> is variable and exceeds <code>size</code>. On the other hand,
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<small>GDB</small> is sometimes clever; the expression <code>A(i)</code>, where
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<code>A</code> is an array variable with non-constant size, will generally
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succeed regardless of the bounds on <code>A</code>, as long as the component
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size is less than <var>size</var>.
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</p>
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<a name="index-show-varsize_002dlimit"></a>
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</dd>
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<dt><code>show varsize-limit</code></dt>
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<dd><p>Show the limit on types whose size is determined by run-time quantities.
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</p></dd>
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</dl>
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</body>
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</html>
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